package com.github.shiqiyue.flow.contol.fliter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.github.shiqiyue.flow.contol.AbstractFlowControlAction;
import com.github.shiqiyue.flow.contol.FlowControlConfigurer;

/***
 * 流量控制filter
 * 
 * @author wwy
 *
 */
public class FlowControlFilter extends AbstractFlowControlAction implements Filter {
	
	public FlowControlFilter() {
	}
	
	public FlowControlFilter(FlowControlConfigurer flowControlConfigurer) {
		super(flowControlConfigurer);
	}
	
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
	}
	
	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		if (request instanceof HttpServletRequest) {
			if (response instanceof HttpServletResponse) {
				if (doFlowControl((HttpServletRequest) request, (HttpServletResponse) response)) {
					chain.doFilter(request, response);
				}
			} else {
				chain.doFilter(request, response);
			}
		} else {
			chain.doFilter(request, response);
		}
		
	}
	
	@Override
	public void destroy() {
	}
	
}
